Canon PIXUS 50i Service Manual page 19

(5) Main case unit assembling
When assembling the main case unit (QM2-0287/0310), assemble with the print head cover in the closed
position. If the print head cover is open, the print head cover switch on the back of the main case unit will
contact the cover sensor of the door sensor board ass'y (QM2-0240), and the sensor is likely to be
damaged.
<Print head cover when assembling the main case unit>
<Print head cover switch on the back of the main case unit>
<Cover sensor>
The print head cover should be closed.
Print head cover switch
(when the print head cover is closed)
Cover sensor:
Special attention should be paid,
as it is easy to bend.
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